138131287 has 8 divisors (see below), whose sum is σ = 160221056. Its totient is φ = 116630712.

The previous prime is 138131251. The next prime is 138131291. The reversal of 138131287 is 782131831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138131287 - 2¹¹ = 138129239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138131207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146793 + ... + 147730.

It is an arithmetic number, because the mean of its divisors is an integer number (20027632).

Almost surely, 2^138131287 is an apocalyptic number.

138131287 is a deficient number, since it is larger than the sum of its proper divisors (22089769).

138131287 is an equidigital number, since it uses as much as digits as its factorization.

138131287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294597.

The product of its digits is 8064, while the sum is 34.

The square root of 138131287 is about 11752.9267418801. The cubic root of 138131287 is about 516.9287489401.

The spelling of 138131287 in words is "one hundred thirty-eight million, one hundred thirty-one thousand, two hundred eighty-seven".